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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .pic_box{width:300px; height:300px; background-color:#beceeb; font-size:0; text-align:center;}
        .pic_box img{vertical-align:middle;}
        .pic_box:after{display:inline-block; width:0; height:100%; content:"center"; vertical-align:middle; overflow:hidden;}
    </style>
</head>
<body>
<div class="pic_box">
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</div>
<script>


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</body>
</html>